The complete core mechanism under the seat, from a Herman Miller Aeron Size A. Everything works as it should with the mechanism, I confirmed and tested it before taking the chair apart. The core unit features forward tilt, backward tilt, up/down adjustment. Everything in the photos is included with the sale. The mechanism, the covers, the side bars, etc. Note that the hip bolts are not included in the sale. I have clearly marked the parts so you can quickly put it together again with just a screwdriver. Please note that this core unit is for a Size A Herman Miller Aeron. Not the more common B (or C). The item in the photos is the actual item for sale.
